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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a65b685e750eb236ae688b91cff96e7434e7abaeda2e493921a9063bcbc91041' 
  AND token = 'Veq0ouM4ii0BIaLmEX1lsIBiWP/4o6JjHmzZQXV1vcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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