SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '453244c6a786c5cec724d1f992e3178f30d342d5e5b3d897daec44d6b5e8329e' 
  AND token = 'INCE2K7rhItOB+AqzB7E3OhDjt/Du/XpwJifmzFv6u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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