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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df4aaba511fd2e957f4e88f222aff924811e869874310445925d36cc05149723' 
  AND token = 'uQo2dg2IAOAGLv1AowJh1eDePwpeP5dw444R3CWDgJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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