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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84f25327c503b0dd2a8af1a8edf666ce158c3a3b6a612e34bddea5c620e6ff35' 
  AND token = 'Kbn6ImnZoYjdd4F8r84aSQnswQRnQQSp8fFlEA2YpHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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