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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '801fb3ea4ee1de14231fe4c3c04e3df691e60a157a18b297f9f13c28c0922922' 
  AND token = '73I2itPHKOGm/x1YFFYw8Yl7cJ5o1CsIRRlIv5y1rNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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