SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5ac2ef004057b71fc1cf0d11298f73d080d86d9ce653c3704befc28bd6ba353' 
  AND token = 'dGRCzKgC4XqS/GFAfla7QC95gHwKlUG9VtcCL6cBl6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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