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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe27fd71667fcff9138d77f1313e9a4c3b29d904fafedbb16ed5415e41bbf9eb' 
  AND token = 'Be/DW4fHMM+eGLy8CdMvDnvzpU66JLxMeqATEShfSP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}