Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28e9a5c5872dad134e7e35ce2b019cebbdc15f3c6fac0cbff6eabb77f8bead54' 
  AND token = 'wyYgBNWXBTOE1qXbz1mwkPx7P+5JSU3WGBl9s4n0sAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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