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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03ac46c72ad073251273653dc548ac8ed48ccb9dce6de3caeb747b3d3a747421' 
  AND token = 'nYP/L/ewSQrqoJQO0bRHpYkxovYnFd2nPxXoivGhp0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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