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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7cf290a612232cc4e8737a8a5321e4283d35cec283c4b7c6a078a8db100575f' 
  AND token = 'cVhRTYuN5ZArz0GGsxl+h0O9SK/IGrKAQaUhMp7Yb84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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