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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94db3cd9d5cea3d3eb14d79fd95d565d012f8ecb8b5af181f18398eed4e42e9d' 
  AND token = 'gDm4kAY0/QXbUWN+Us3TpvQ56XxZhMAhWFLp6LljWEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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