SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e147334602d21cab4d342551cc81e36569df6b411d909b82413bdf3d2549890' 
  AND token = '7XJvftOJEUK+hN35GzIwynXDa1MX10Am5jsa9WVVbZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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