SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2e1125d9666af6db6e3cd92a4e0cec5e91d8dd1275c72cfac7675b938823e1a' 
  AND token = 'p7s4H/66oZMrqn/v/ogSTJxqpLYq1Qi4RGKgPmUd6A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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