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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efd6415c1fd10bd3d052fc9ac4eb78ff9e269c0312f6371cf6499c63a44cae40' 
  AND token = 'EYc8LNdX6Y0TOcrWQ13dqtxSNPcIeehkDgOiPJj4AOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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