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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '373c0e59dbceaf82b950a348c66c81031082254042999bf7d6e2b592388f73dc' 
  AND token = '1M2KS3zesaTAS9YNwf61z4ydNLwiJY9wyrXg+t52FaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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