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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0246e5cc02a7dddc29af0a68c656ac63d95e9ee35b9adf64c4f72db8ad1503f2' 
  AND token = 'ttd+1tzZej6bsCEY2ObQFw9Fi+EPsMiM35GiONvLgw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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