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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b9f5caaa798e4c0dd3a47356c0616052ab37bd7ac725c25bbd2535881939a61' 
  AND token = 'uOjN5katuO9W8VaumoHwLgGtd1KgRrUaZ0YFT0CUans=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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