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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a955d9e27984022371fcafee0a4cac90e7e2a49d561a3457286557ba996989d' 
  AND token = 'CsNfnv7Qd85qb9H3CbTHPeqK9RRCIF11TmZn/QMXVdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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