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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d6505e3f45e5bffa4d404c8b6a618c785647119861f8e2f7de5484863fbd815' 
  AND token = 'T+CmzHFsMj+gxIWvz1bXPIHrNOglQaOrQlMFSx3SvNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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