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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afcabf12f8de53b822a6e3f1d945a40da278e18b914205c08f967446a3e0c120' 
  AND token = '8MJIXGL20c1r9Bsw16KN6oZK4Ldc6fpkaINCETw5tPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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