Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3276e42ea6c8c21ef94d21f38b016a7219db6350712a5bb8dcd2a277d590124' 
  AND token = '7Loeta9yFG6pUciama0vrLU7oHqDWv54ZzedP+sOiqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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