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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75f58366a56fde94ce0d37ce6ae7f8ed53ccb409c7d919cf2d65e6a8b5af75dc' 
  AND token = 'hjQj4E94QbeZ53FeBt54PLwx6DHZr5aimZoFBG2+lJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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