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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34b97c185efedee6e71d9c4340c65efa3dee2df23ee1cb6f283895ff3d6c2dd2' 
  AND token = 'FV2AFP0VlXwm1ZTLkObzhn739FH0pxYaTu1HhEFuT+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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