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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1269e951da80dfcabe9f0698be2b5d229f77741176469e55cd99011c161209b' 
  AND token = '2si2N1UAypeqsRqiGho6ZC0SQhschLOgTsDw+gnX8tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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