SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b5bd7bdf6fd57e72ff828981b8ac1d478764df3838f2d41d9e265b7d5de66b6' 
  AND token = '01TPJflF3KOagX4QoUKLpvGUV08qJRwXkFf0IFIy3ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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