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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20704a87f2676c61330860f3e1898c34e81db99c3776ecac6403430144f64ccb' 
  AND token = '+kBCS3mXl/196erBCTttv5V0ZWO5ROLHzW97KcWDKMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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