SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af97b43c25fb8c68e17d89f2b531d3a2989f3ec6124af2dba3abf4342db6a63c' 
  AND token = 'wLP3veoRT9+ZsDpDU6grQsAuVKWgPMVTjguDk+aZFTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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