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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fc884529100f623dafcff6a963af98dfcd936e7bf49126464a5e3b248ccd790' 
  AND token = 'VGOb/SIh8p8wVI6Hbn607M7wcmaTiJnQyyCO3ywjB24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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