SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba371627a194bbe773f9c754643b8f7c5baf602d8e83b360579153b6942cbf23' 
  AND token = 'SM9TL6vfdhZL+u3sA2+mBFmgg7qteHjV4/lFg6oq5ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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