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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f50326d29297725608b54d39875667674942f171f8cf80afdb05949ef1be04f9' 
  AND token = 'nw/UyXCPP7S3P6QFRAXVmCe4mPmShkd8b87bCgX7Hhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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