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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f576068725f4338738a7e6c4dd0b14b2f2490fb2a4f632ced27ad60cfe87716b' 
  AND token = 'mDYRYt7MJWRNXVolsYdHYq5yFzHZUTOr6dUaU/vN6fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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