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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fc165d469a0ab91ff11cab8b6c74d9ed276694b8b66fdf44295be52d9fca1be' 
  AND token = '97irR3i4pRndUkg4FYAe16JdndqFt/hN7gDfDmBYVpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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