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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3edcbe0726a4a18dad97f9c2c2c4544dac1435140c39129be93052b81709abfd' 
  AND token = 'y/z4U/4/WbZ0z4vP/I3q/goyAnfXa73kpevGg3jw5lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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