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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04d4e0bcdd19a7232dfd4a0329e7c7b9f2a791ed81f2199df9498fbf1d3b86c6' 
  AND token = 't7X2ln+eg5FVMDfRYnRlYcC8RxUj9TlbcrIdHD9eZBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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