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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d610ea0258f3493fa92531fb0313397d265a6876355b9609137acb4d330d056' 
  AND token = 'AArdICs0bAHOxrYK5td7jptF0lE8TObRokx56MrrMTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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