SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '332ceeaef7663facf72e43e437ab8d014a003756eb4b905fca532c85ec0347f5' 
  AND token = 'e3HlRlnKo/wAtIzvY76X9o9ioX+LdxLWKSdjqZBVevA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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