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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee17ba12dd5a312daa69575b35cc7042da5907c9de8add2f2f0950c601a0cfda' 
  AND token = 'Q529xqy7yFNwFG6UhNpGj/2xHYhSAr2hWhCjjuwMmCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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