SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed3094022bc87e16f3f0c3ff790d47bb2350f161ee1d07cb0f5c538a91df1d82' 
  AND token = 'kKY/DIDKglRPGQKxGj6ip2Q547EFJIAMKGc1hlvXL5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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