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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cef3977ab8db881c4a7c27d44dd41c6f9c23b9efb1314bfe9c9ff911801dbcd6' 
  AND token = 'bkkrvfLIhv6enYB7mg+jJWoad89jWjkKKlbZKRIL14U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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