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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcd4b66fe4b418b4830a5243493681a50b94f2dd5ae1610f48b5537b35ea1411' 
  AND token = 'kT5YsnLg3QytzXeDjaKN6ykubG7bFO7N1bDUZKvIJFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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