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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b8fd60751aecea2c79e8e2681998762301301ad1b87c68de79c707e2e13edaa' 
  AND token = 'fu+KUiSmbddB1t+c27pWumDMHlRNebHGO19zo8y3TOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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