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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c82005291f469c81ccdc66383cece6ac39c392b28119eec8a0f55bb97ff53b96' 
  AND token = 'X3870nikqtjyU/aSfkf8GMdg+aI2FJoMAQvINxIr+Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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