SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf824f35a28648ef247d42f07c3a83be69cc6a062cc69fc441cd3045d1af6dfb' 
  AND token = '716VAaDLeSaiwL1PU8pGkFpzCVFFmv/ZAXhufoACgxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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