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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8deb064b43ad13f719b453a5d45bd6fa7ca5f72a09316cbeb1a1bf2791d1f77f' 
  AND token = 'A3UVMN978mvDcz/zr5x5QnQyr+HKDJRuMtk/tkey19M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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