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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e275313219b2095116e9f2f8e42d8d146e9b1f833ac6024d3d7db2bac4c0cf7b' 
  AND token = 'rVriMDrOXTDKh/NCuS8IcoSsiVPiSLlsB6s4Kuc35FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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