SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87f832b2d93d7af4754e3367957deaf42bf391b1f13417b6b36d20f094e58b39' 
  AND token = '13OOEZDKiSPvxW94cDmV+2a3CYxxPf5j+Jj4wxiq1Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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